Advantages of floating fish sinking fish pet extruded feed
1. Improve feed utilization
The heat, humidity, pressure and various mechanical effects during the puffing process generate low molecular weight products such as glucose, maltose, maltotriose and maltodextrin. Puffing process can increase the starch gelatinization degree, and the cell wall of the fiber structure is destroyed and It softens and releases partially enclosed and bound digestible substances. At the same time, the fat penetrates into the surface from the inside of the granule, so that the feed has a special flavor, improves the palatability, and increases the food intake rate.
In addition, the protein in the vegetable protein feed can inactivate certain protease inhibitors such as antitrypsin and urease after moderate heat treatment, and destroy the hydrogen bonds and other secondary bonds in the protein, causing the original polypeptide chain The spatial conformation changes, resulting in protein denaturation, the denatured protein molecules become fibrous, the peptide chain stretches loosely, the molecular surface area increases, the flow is blocked, and the contact with the enzymes in the animal body is increased, which is conducive to the digestion and absorption of aquatic animals. Improve the digestibility and utilization of nutrients by 10% -35%.
2. Reduce environmental pollution
The extruded floating fish feed has good stability in water. The feed pellets processed by extrusion and expansion rely on starch gelatinization and protein organization in the feed to make the product have a certain adhesion or binding force. Its stability is generally more than 12h, and the longest can reach 36h, so it can Reduce the dissolution and precipitation loss of feed nutrients in water. Data shows that the general use of extruded floating fish feed can save 5-10% compared to powder or pellet feed, and can avoid feed residues in the water and reduce water pollution.
3. Reduce the occurrence of diseases
Feed ingredients often contain harmful microorganisms, such as aerobic organisms, neutrophils, Escherichia coli, molds, salmonella, etc. The content in animal feed ingredients is relatively high. The high temperature, high humidity, and high pressure of expansion can kill most harmful microorganisms. According to data, the number of Escherichia coli per gram of raw material is up to 10,000, and only less than 10 are left after expansion. Salmonella can basically be killed after being expanded at a high temperature above 85 ℃, which helps to maintain water quality and reduce Unfavorable environmental factors in aquaculture, while reducing the mortality of aquatic animals.
4. Increase breeding density
Under artificial breeding conditions, the increase in breeding density means the higher the return rate for farmers. When the aquaculture density per unit of water is increased, the space for fish in the aquaculture water is reduced, and the requirements for water quality will be much higher than the level of the natural environment. Because the use of extruded compound feed can reduce the feed coefficient and greatly reduce the residual bait and excrement discharged into the water body, it is possible to greatly increase the breeding density.
5. Extend the feed storage period
Extrusion processing improves the stability of raw materials by reducing bacterial content and oxidation. When the extruded product is dried and cooled, the feed water activity (AW) has been reduced to 0.6 or even 0.4, which is equivalent to a moisture content of 8% to 10%, which better improves the storage stability of the feed.
6. Convenient feeding management
Aquatic extruded feed can be suspended on the water surface for a long time, and there is no need to set up a special feeding table when feeding, only fixed-point feeding is enough. Fish need to float on the surface of the water when they eat, so they can directly observe the fish's eating situation, adjust the feeding amount in time, and understand the growth and health of the fish in time. Therefore, the use of aquatic extruded feed is helpful for scientific feeding and management, which not only saves a lot of time, but also improves labor productivity.
7. It can meet the needs of animals with different feeding habits.
According to different processing techniques, extruded feed can be divided into three types: floatability, slow sedimentation, and rapid sedimentation. At present, about 80% of fish feed is sedimentation feed. For example, shrimp, salmon, salmon, and yellowtail tuna all like sedimentation feed, while catfish, tilapia, eel, and most fish juveniles like floating feed. , Catfish and tilapia have the same preference for sinking feed and floating feed. In addition, extruded feed can also meet some special requirements, such as low-moisture feed and high-fiber feed.
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